Custom domain names such as www.myname.com are not available for your Studio Operations website in the current build.
Custom domains are planned for Studio and Studio Plus. There is no current connection step to follow, and choosing a paid plan does not enable a custom domain yet.
Use your current website address
Open Website → Web address to manage the Studio Operations-hosted artist address. This screen does not connect a custom domain.
For the existing website controls, read Build and edit your Studio Operations Microsite (Website). Plan availability is explained in Understand plans and artwork limits.